x gm of metal (E=12) was completely dissolved in 100 ml of N/2 HCl. The solution was then made upto 500 ml. 2.5 ml of this diluted acid required 12.5 ml of N/10 NaOH for complete neutralization. Find the valency of x.​

The quantity of moles in 57.0grams of RbF is 0.545mol.

Moles is the base unit of amount of substance i.e. the amount of substance of a system which contains exactly 6.022 × 10²³ elementary entities (atoms, ions, molecules, etc.).

The number of moles of a substance can be calculated by dividing the mass of the substance by its molar mass.

No of moles = mass ÷ molar mass

Molar mass of RbF = 85.467 + 18.998 = 104.5g/mol

moles = 57.0g ÷ 104.5g/mol = 0.545mol

Therefore, 0.545moles is the quantity of moles of RbF in 57.0grams of the compound.

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The metamorphic rock on high temperatures could melt and result in the formation of Igneous rock

New rock formation happens when there is an increase in temperature or pressure or in some cases both.

On either high temperature or high pressure, the metamorphic rock would melt. The melting of metamorphic rock would result in magma. This magma on cooling solidifies and forms Igneous rock. It is crystalline/glassy in nature.

On the other hand, if igneous rock melts under high pressure or temperature, it would revert back to metamorphic rock.

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Answer:

75.114ml

Explanation:

volume = mass÷ density

The formula on the left, which consists of two sodium ions and one sulfide ion, is the equation for the dissociation of sodium sulfide in water. The ions split from one another as the chemical dissociates in water. On the right side of the equation, there are 2 Na+ ions and 1 S2- ion.

Na2S(s) ---> 2Na+(aq)  +  S2- (aq)

Being a strong acid, hydrogen bromide, or HBr, has the equation HBr(aq) -> H+(aq) + Br- for its dissociation (aq). The equation for hydrogen flouride, or HF, is HF(aq) -> H+(aq) + F- because it creates a weak acid (aq). Weak acids create equilibrium, which is why the two-way arrow is there!

The hydrogen bromide ionizes and dissolves in water as follows:

H3O+(aq) + Br- = HBr(g) + H2O(l) (aq)

A soluble ionic molecule called lead(II) nitrate, Pb(NO3)2, completely dissociates in water to produce lead(II) cations, Pb2+, and nitrate anions, NO3. Hydrogen sulfide, H2S, is bubbled through the solution in order to precipitate the lead(II) cations.

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The volume of a liquid is not substantially affected by variations in pressure. Any pressure increase can only slightly shorten the distance between the densely packed molecules, liquids are incompressible.

Increased pressure occurs as depth increases. The pressure in a liquid is influenced by the mass of the surrounding water above. Due to the near proximity of the molecules in a liquid, pressure exerts itself in all directions.

"Pressure" is described as the thrust (force) applied to a surface per area. The force to effective area is another way to describe it (over which the force is acting).

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The correct formula of  the dicarbon tribromide molecule is shown as [tex]C_{2} Br_{3}[/tex].

The chemical formula is the representation of a compound on paper. It is the way by means we are able show the way that atoms of a compound are connected to each other. We often use this method to show the representation of a compound in way that is somewhat intelligible to someone who needs to understand it.

We are now going to try to see how we could be able to find the correct formula of the compound knowing all the subscripts required in the process.

Now, most importantly, the formula must show the number of atoms of each of the elements that are in the compound. Looking at what we have, we are asked to find the formula of the compound dicarbon tribromide. We already know that there would be two atoms of carbon and three atoms of bromine in the compound.

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The number of breadths supplied by the 200 atm scuba tanks, found using Boyle's law, taking the air as an ideal gas are as follows;

First tank with 14.2 L volume delivers 1,893.[tex]\overline 3[/tex] breadths of air

The second tank with 11.4 L volume, delivers 1,520 breadths of air

An ideal gas is a gas that is not subject to particle to particle interactions, and consists of many particles

The given parameters are;

Pressure air in the two scuba tanks, P₁ = 200 atm

Volume of air in the first tank, V₁₁ = 14.2 L

Volume of air in the second scuba tank, V₁₂ = 11.4 L

Volume of air delivered for each breadth, Vₐ = 1.5 L

Pressure of air delivered by the tank regulator, P₂ = 1 atm.

According to Boyle's law, at constant temperature, the pressure  of a given mass of gas is inversely proportional to its volume

Mathematically, we have;

P ∝ V

P₁·V₁ = P₂·V₂

The volume occupied by a given number of breadths, n, Vₙ = Vₐ × n

According to Boyle's law, the number of breadths supplied by the first tank is therefore;

P₁·V₁₁ = P₂·Vₐ·n

Which gives;

[tex]n = \dfrac{P_1\cdot V_{11}}{P_2 \cdot V_a}[/tex]

Therefore;

[tex]n = \dfrac{200\times 14.2}{1 \times 1.5}\approx 1893.\overline 3[/tex]

The number of breadths supplied by the first tank is 1,893.[tex]\overline 3[/tex] breadths

Similarly, the number of breadths supplied by the second tank is given by the formula;

P₁·V₁₂ = P₂·Vₐ·n

[tex]n = \dfrac{P_1\cdot V_{12}}{P_2 \cdot V_a}[/tex]

[tex]n = \dfrac{200\times 11.4}{1 \times 1.5}\approx 1893.\overline 3 = 1,520[/tex]

The number of breadths supplied by the second tank is 1,520 breadths

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The pairs that are likely to form an ionic bond are;

Let us recall that a compound is formed if we are able to join the atoms of two elements together. There are basically three kinds of bonds that we can have in a substance and these are;

If the two elements are now bonded in the compound the properties of each of the atoms is now modified and what we now have is the singular properties of the compound.

We can see a list of several compounds and we  are to find out if the bond that the atoms have between them is an ionic or not. This has been done in the section above and we can see there the compounds that are most likely to have an ionic bond.

Note that in the ionic bond, there is a transfer of electrons from one atom to the other. This can be shown by the use of an arrow. The transfer would always occur from the atom of a metal to the atom of a non metal.

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The Rf value is used to produce a final confirmation of the identify of a substance its true sentence

In thin-layer chromatography, the retention factor Rf is used to compare and help identify compounds and the Rf value of a compound is equal to the distance traveled by the compound divided by the distance traveled by the solvent front both measured from the origin and Rf values are used to determine polarity, relative masses, and relative solubility's, among other things

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Plasmids help you obtain the copies of the gene you need.

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Utilize this chemical equation balancer to balance the Al + HCl = AlCl3 + H2 reaction! ... It's possible that the equation 2Al(s) + 6HCl(aq) = 2AlCl3(aq) + 3H2(g) is ionic.

Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.

Experts disagree that drinking hydrogen water has any hazards. However, they are unsure if its advantages outweigh those of drinking regular water or being hydrated in general. Hyponatremia, which can be fatal, can result from excessive water intake.

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Will Argon, Neon, and Krypton react same

Noble gases only helium and neon are truly inert and the other noble gases will react on a limited scale under very specific conditions and krypton will form a solid with fluorine, and xenon will form a variety of compounds with oxygen and fluorine and the name comes from the fact that these elements are virtually unreactive towards other elements or compounds and they do not react with other element

Neon is a colorless, odorless, unreactive gas and argon is a colorless, odorless, unreactive gas and krypton is a colorless, odorless, unreactive gas

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Kinds of intermolecular forces exist between acetone molecules is Hydrogen bond.

A. CH3 -C-CH3.

B. The molecular is nonpolar.

C. Dipole-dipole interactions.

D. CH3-CH₂-OH → 1-proposal if dissolves in water form the strong Hydrogen bonding Acetone with water when Compare with 1-prop and have more strong Hydrogen bonding due to its bending 1-propenal has more boiler point.

Molecules with oxygen atoms nitrogen atoms or ionizable groups -CO2H and -SO3H tend to be polar. A non-polar molecule is a molecule that does not have regions of positive and negative charge. Ethane is an example of a non-polar substance. A bond is considered nonpolar if the electronegativity difference is less than about 0.4.

When things are different at both ends we call them polar. Also, some molecules have positive and negative ends, and when they are present, we call them polar. Otherwise, it is called non-polar. Polar things can attract or repel each other. Opposite charges attract and charges repel.

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According to the given statement the molar mass of the gas is 39.400 g/mole.

The mass in grams of one mole of a substance is its molar mass. The molar mass of a substance can be determined by adding the molar masses of its component atoms, as shown in this video. The computed molar mass can then be used to convert the mass and the number of molecules of the substance..

From ideal gas equation we know,  PV = nRT

PV =w/M * RT

n is number of moles = w/M,  

we = weight of gas,

M = molecular weight of the gas

PV = wRT/M

Value of pressure, P = 1atm and standard temperature, T = 298.15K

Value of universal gas constant,

R = 0.082 lit. atm. K⁻¹.mol⁻¹

Weight of gas,

w = 0.8058g and volume of gas,

V = 500mL = 0.5 Liters

Substituting all the value, we get   :

Molar mass = 0.8058* 0.082 * 298.15 / 1 * 0.5

Molar mass = 39.400 g/mole

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Answer:

cell wall

Explanation:

plant cell have cell wall and can go through the process of plasmolysis.

they also contain stoma

animal cell are smaller

Let us take the isotope as E then Z is its atomic number and A is the mass number. Thus, if Z = 42 and A = 98 then the isotope can be seen as [tex]^{98}_{42}E[/tex].

Add the antithesis of the charge imbalance to the number of protons to determine the number of electrons.

For instance, a phosphorus isotope with an atomic number of 15 has a -3 charge, meaning that there are three more electrons than protons in that isotope.

The atomic number should be written as a subscript and the mass number (protons + neutrons) should be written as a superscript to the left of the atomic symbol when writing the symbol for an isotope.

Standard, or “AZE,” notation can also be used to describe isotopes, where A stands for the mass number, Z for the atomic number, and E for the element symbol. To the left of the chemical symbol “E,” a superscript denotes the mass number “A,” and a subscript denotes the atomic number “Z.”

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Answer:

6. Al
7. 3

Explanation:

When looking at ionization energies to find the number of valence electrons, look for big jumps in ionization energy. The jump from first to second is big, but it's only about 1200 kj/mole (which is considered to be a medium small jump). This means that the first electron and second electrons are both likely valence electrons (since the energy needed to remove them is relatively small). From second to third, the change in ionization energy is less than 1000 kj/mole. Since the third ionization energy is also quite small, the third electron is also likely to be a valence electron. However, looking at the change in ionization energy from the third to the fourth, the jump/difference in ionization energy is nearly 9000 kj/mole! That's 7 to 9 times the amount of the previous jumps. From this, we can reasonably assume that this is a core electron, which takes lots of energy to remove from an atom. Therefore, the fourth electron is a core electron, and this atom only has 3 valence electrons. Now, we can answer question 7. It is C. From this, look at number 6. Na only has 1 valence electron, Mg only has 2 valence electrons, Si has 4 valence electrons, and only Al has 3 valence electrons. Since this mystery element X has 3 valence electrons and Al also has 3 electrons, Al is the most fit for the data given. So the answer to number 6 is C) Al

tl;dr there is a jump of ionization energy from the 3rd ionization energy to the 4th ionization energy so that means that the 4th electron is a core electron, and the element only has 3 valence electrons. Al has 3 valence electrons

Condensation is a chemical reaction of synthesis. It represents two organic molecules producing one organic molecule and a water molecule.

Condensation reactions are reactions in which two or more substances combine together chemically to produce a larger molecule with the elimination of a small molecule such as water, ammonia, or HCl.

Condensation reactions are important reactions in the formation of polymers.

Polymers are large organic molecules that are composed of smaller repeating units known as monomers.

An example of a condensation reaction is the reaction in which two amino acids are linked together by a peptide bond to form a dipeptide. A water molecule is also eliminated.

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The equation representing the heat of reaction in letters is ΔH = q = [tex]cp_{sp}[/tex] x m x (ΔT)

Heat of reaction is also known as Enthalpy of the reaction. It is a measurement used in thermodynamics energy that was produced or released in a reaction. ΔH represents change in heat or enthalpy

Heat of reaction, ΔH = q = [tex]cp_{sp}[/tex] x m x (ΔT)

where,

ΔH and q represents heat of reaction

m represents the mass of the reaction medium

[tex]cp_{sp}[/tex] represents the specific heat capacity

ΔT represents the difference in temperature of the medium

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Answer:

B is the answer

Explanation:

H2SO4 contains:

2H

1S

4O

4 is double of 2

Explanations

Given the following

Mass of potassium carbonate = 22.5grams

Determine the moles of potassium carbonate

Moles of potassium carbonate = mass/molar mass

22.5/138.205|

= 0.1628moles

Since the precipitate formed is aluminum hydroxide, hence the mole of precipitate formed if 3moles off K2CO3 produce 2moles of Al(OH)3 is given as:

Hence the moles of dried precipitate should be formed

Answer: Right Side

Explanation: The nonmetals or non-metals are a group of elements located on the right side of the periodic table (except for hydrogen, which is on the top left).

Answer: non-metals are on the right side of the periodic table. They are located to the right of the line (usually appears as a dark latter). Note that hydrogen is not located there but it is also a non-metal.

Atomic numbers are the numbers possessed by an element in a periodic table. These numbers are used to identify an element and their position in the periodic table.

The atomic number of an element is equal to its proton and electron number but not its neutron

Hence we can conclude that the correct information about the atomic number of an element includes:

• The number of protons

• The element position on the periodic table

The molecular weight of oxygen gas is 32 grams per mole, and we calculate the weight of the atmosphere based on this estimate.

Solution:

PV = nRT

6.30 x 1.95 = n x 12.285 x 290

n = 0.6226 moles.

The molar weight of oxygen gas is 32 grams, mol on which to estimate the atmospheric weight. Irregular Edges Edges are often jagged chipped or blurred. The pigment can spread to the surrounding skin. Uneven Colors Black brown and tan shades may be present. White, gray red, pink, or blue areas can also be seen.

If the mole is larger than other moles has dirty or uneven edges is uneven in color, or is slightly pink see a doctor for an examination. please give me. Bruises that appear in adulthood should be checked. However, the most worrying sign is the change in the mole. Experts believe that genetic factors, hormonal changes, and sun damage can cause new moles to suddenly appear, but no one knows for sure.

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Answer:

im pretty sure its transition metals

Explanation:

An object’s displacement is the distance and direction of the object’s change in position.

Displacement in physics is the quantity which denotes distance with a directional component.

Displacement and distance are two inter-related terminologies that are often misused, however, they differ being that displacement is a vector quantity while distance is a scalar quantity.

This means that displacement has direction and magnitude, hence, can be defined as the distance and direction of an object’s change in position.

Displacement is denoted by ∆x and is calculated by dividing the change in position by time taken.

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The change in the total energy of the system is -93.1kJ.

Let us note that the term thermodynamics has to do with the study of heat. Recall that heat is that which leads to the increase in the temperature of a body. From the first la of thermodynamics, we know that heat can neither be created nor destroyed but can be transformed from one form to another as we can see.

We also know from the first law of thermodynamics that;

ΔE = q + w

ΔE  = total internal energy

q = heat absorbed or evolved

w = work done

Let us find the work done as;

w =pΔV

w = 45.0 atm (3 - 8.8)

w = -261  atm L or -26.4 kJ

We have q as  -66.7 kJ  because heat was released

ΔE  = -66.7 kJ - 26.4 kJ

ΔE  = -93.1kJ

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The balanced NET ionic equation for the reaction when (NH₄)₂CO₃  and CaCl₂ are mixed in aqueous solution.

  Ca²⁺(aq)  +   CO₃²⁻(aq)     --->   CaCO₃(s)

The reaction is :

(NH₄)₂CO₃        +    CaCl₂  ----->    NH₄Cl      +    CaCO₃

1) the balanced molecular eqaution :

(NH₄)₂CO₃(aq)     +    CaCl₂(aq)  ----->    2NH₄Cl(aq)      +    CaCO₃(s)

2) split strong electrolytes into ions : complete ionic equation

2NH₄⁺  +  CO₃²⁻   +   Ca²⁺   +   2Cl⁻  ----->    2NH₄⁺    +   2Cl⁻  +  CaCO₃

3) eliminate the spectator ions on both sides of ionic equation:

CO₃²⁻(aq)   +   Ca²⁺(aq)  --->   CaCO₃(s)

4) The net ionic equation is :

Ca²⁺(aq)  +   CO₃²⁻(aq)     --->   CaCO₃(s)

Thus, The balanced NET ionic equation for the reaction when (NH₄)₂CO₃  and CaCl₂ are mixed in aqueous solution.

  Ca²⁺(aq)  +   CO₃²⁻(aq)     --->   CaCO₃(s)

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